4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or...
-
Upload
colin-paul -
Category
Documents
-
view
220 -
download
0
Transcript of 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or...
![Page 1: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/1.jpg)
4.3: The Plasma Membrane
![Page 2: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/2.jpg)
Functions of the Plasma MembraneAllows only certain molecules
to enter or leave
Separates inside from outside
Allows waste to be expelled
Interacts with its environment QuickTime™ and a
decompressorare needed to see this picture.
![Page 3: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/3.jpg)
QuickTime™ and a decompressor
are needed to see this picture.
![Page 4: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/4.jpg)
Two Parts of Membrane1. Membrane Lipids -
Phospholipids form a bilayer
Heads are in the water, tails are out
Sterols - other lipids between the tails that make the membrane more firm, prevent freezing
QuickTime™ and a decompressor
are needed to see this picture.
![Page 5: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/5.jpg)
Two Parts of Membrane2. Membrane Proteins -
“Integral proteins”
Embedded in the lipid bilayer
QuickTime™ and a decompressor
are needed to see this picture.
![Page 6: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/6.jpg)
Uses:
To identify the cell type
Channels, allow certain substances to enter
Docking sites for chemical messengers
![Page 7: 4.3: The Plasma Membrane. Functions of the Plasma Membrane Allows only certain molecules to enter or leave Separates inside from outside Allows waste.](https://reader035.fdocuments.net/reader035/viewer/2022062423/5697c01d1a28abf838cd0a69/html5/thumbnails/7.jpg)
Fluid Mosaic ModelThe idea that the membrane behaves like a fluid
more than a solid.
The proteins can move laterally within the bilayer.
QuickTime™ and a decompressor
are needed to see this picture.